The GOP nominee ended August with $97 million in his campaign and two fundraising committees, while rival Clinton had $152 million in her campaign and joint fund bank accounts.

In August, Trump raised $70 million in small donations, gained $18 million in larger donations, and donated $2 million to his own campaign. In that same month, Clinton raised $62 million for her own campaign and another $81 million for her joint funds with the Democratic Party.

The Journal reports Clinton's financial advantage could mean more advertising and larger amounts of staff leading into the November election. Trump has been reserving more advertising time, but has relied on free media coverage.

The real estate mogul has had notable success with small donations, the Journal reported. In July, 64 percent of Trump's donations were $200 or less, while 36 percent of Clinton's donations were the same.

Trump's campaign has 2.1 million donors, while Clinton has 2.3 million, according to the Journal.

Trump earned more in August than in July. He raised $5 million in a single day after his meeting with Mexican President Enrique Pena Nieto and his speech on immigration.

Super PACs that support the candidates reported widely differing totals. Through July, a pro-Clinton super PAC raised almost $110 million, while a pro-Trump super PAC in that time raised $12 million, the Journal reported.

The methods Clinton uses in fundraising came under fire from Trump's sons Eric and Donald Jr. They criticized Clinton for attending fundraisers in areas populated by wealthy donors, such as the Hamptons, while their father himself attended fundraisers in the Hamptons, according to BuzzFeed News.